Abstract: It is suugested to divide the Sichuan and Yunnan provinces into six strong seismieactiv regions based on the correlation analysis of strong earthquakes and annual amount of rainfall in the epicentral areas. Then, by means of a iterative method of computation, equations of medium range prediction for strong earthquakes, M 6 of the six regions and for earthquakes, M7 of both the Sichuan and Yunnan provinces.